Ok heres an easy one for you. we start with F=ma SI --> newtons=kilograms*gravity English --> pounds=slugs*gravity So now why if you weigh yourself on an english scale it is in pounds, but if you stand on a metric scale it is in kilograms? Ive solved plenty of F=ma problems throughout my college courses, but this question is something that just dosent seem clear to me. It seems that the units are wrong, shouldnt they be reading newtons & pounds or kilograms & slugs? I never even heard of a newton or a slug until I started studying engineering.